Materials Literature
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The differential heats and the adsorption isotherms of water on α-Al2O3 have been measured at five different temperatures in the range 200–400 °C using a microcalorimetric–volumetric apparatus. The amounts of water adsorbed and integral heats decreased with increasing temperature. At all temperatures the differential…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(aryl prehnitimide)sZhi Yuan Wang and Yu QiCite this: Macromolecules 1994, 27, 2, 625–628Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021/ma00080a048https://doi.org/10.1…
New polyetherurethanes carrying fluoroalkyl substituents in the side chains were synthesized from N,N-di(hydroxyethyl)heptadecafluorooctyl-sulfonamide (a chain extender), 4,4'-disocyanatodiphenylmethane, and poly(tetramethylene glycol). Various kinds of polyetherurethanes having different tensile properties were prepa…
An overview of the present knowledge about the effect of ionizing radiation on properties of cholesteric liquid crystals is given. It includes the effects caused by either electromagnetic radiation or particles. Particular attention has been paid to the liquid-crystalline properties of cholesterol derivatives and thei…
The immobilisation of heteropolyacids into polyaniline films has been studied using the probe beam deflection technique, X-ray photoelectron spectroscopy and scanning electron microscopy. The results indicate that the heteropolyanions modify the redox behaviour and morphology of polyaniline.
β-Octasubstituted tetramesitylporphyrins have been prepared in good yields by Suzuki cross coupling of β-octabromotetramesitylporphyrin with aryl- and alkyl-boronic acids. A single-crystal X-ray analysis of -octamethyltetramesitylporphyrin 3a shows a saddled non-planar structure.
The swelling and irradiation creep behavior of cold-worked 316Ti and 15-15Ti, two variants of austenitic steels in use as core component materials of the French fast reactors, are compared. The use of 15-15Ti leads to a significant improvement due to an increase in the incubation dose for swelling. The same phenomena…
An endoproteinase, which specifically cleaves the Pro12-Leu13 bond of the extrinsic 18-kDa protein of PSII, was purified from PSII membranes of spinach. The presence of 0.05% (w/v) Tween 20 and 1 M NaCl was essential for maintenance of proteolytic activity during the purification. The molecular mass of the enzyme was…
In classical packing theory, composite packing density of a bimodal mixture is increased by increasing the component fine or coarse packing density via particle size distribution broadening. In this study, the effects of particle size distribution shape of component fine and coarse particle distributions on composite…
Since equipment, built to eliminate the NOx gas in the off gas of iron are sinter plant, is huge inci expensive, it is desirable that a more simple and economical method to eliminate the NO gas is established.The method to eliminate the NO gas near the coke in the iron are sinter bed has been studied. As a basic study…
Hexagonal BaTiO3 was formed by doping only 2mol% of Mn. Investigation of this effect of Mn in terms of its valency state and size of Mn ion revealed that the small size of Mn4+ ion is a dominant factor favoring the formation of the hexagonal phase.
Abstract
Porous particulate polyimides have been prepared by four suspension polycondensation procedures. The first group were linear polyimides prepared in suspension in liquid paraffin from a poly(amido acid) pre-polymer solution. Groups two to four were crosslinked using a tetraamine component. The first of these employed a…
The effect of thermal treatment on the microporous accessibility of an aluminium pillared clay has been investigated. When the calcination temperature was increased up to 673 K, the specific total (or micropore) surface areas increased, but a further increase in the calcination temperature produced a decrease in the s…
Some currently-available formulations of LaRC™-TPI, a thermoplastic polyimide originally developed at NASA-Langley, were found to be highly susceptible to environmental stress cracking when exposed to solvents such as acetone, toluene, diglyme and methyl ethyl ketone. The combination of stress and solvent led to rapid…
The title compound 3 is readily available from 1, 3, 5-triacetylbenzene in a three-step procedure and is an efficient trifunctional core reagent for the synthesis of dendrimers.
The inhibitory effects of chitosan on germination and production of zoospore, and growth of vegetative hyphae of Saprolegnia parasitica Coker were examined. Zoospore germination was completely inhibited by chitosan at the concentration of 0.06%. Mycelial growth was not observed on GY media containing 0.05% chitosan. Z…
New organo-mineral nanocomposites are prepared by reacting ethylene glycol and other diols with the interlemellar silanol groups of the layered silicic acid, H-magadiite, to afford organically pillared layered silicates.
Cathodic polarization of aluminum in acid solution produces a surface film which was studied using infrared reflectance spectroscopy (IRS), and quartz crystal microbalance (QCM), and capacitance measurements. According to the QCM results, deposition of the film began after passage of 7.2 mC/cm 2 of cathodic charge at…
Basics: Ultrasound. Electromagnetics. X-Rays. Others. Methods: Materials Sorting. Microstructure. Macrostructure. Residual Stresses. Materials Properties. Applications: On LIne. Off Line. References. Index.